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  • Plano concave lens is an optical lens with one flat surface and the other concave surface. These lenses are primarily used for beam divergence or optical path adjustment, and are commonly found in optical systems, laser equipment, telescopes, microscopes, and other optical instruments.
K9 Plano concave lens

These plano-convex lenses are also available in uncoated versions and versions with three broadband antireflective coatings: A-coating (350-700 nm), B-coating (650-1100 nm), or C-coating (1050-1700 nm).

Technical parameters with K9 Plano Concave Lens

Substrate Material H-K9L Diameter 5-800mm
Diameter Tolerance +0.0/-0.1 mm Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1% Clear Aperture >90%
Design Wavelength 587.6 nm Refractive Index 1.5168
Surface Quality 60/40-20/10 Surface Accuracy λ/4- λ//8
Lens Centering Error <3' Coated Uncoated, VIS, NIR, SWIR

spectral curve with H-K9L Plano Concave Lenses

k9 uncoated
k9 vis coated
nir coated
swir coated

H-K9L Plano Concave Lens Inventory Informations

Diameter (mm) Focal Length (mm) Center Thickness (mm) Edge Thickness (mm) Coating
6 -9.8/-18-24 1/2 1.98/2.5/2.4 NO/ VIS/ NIR/ SWIR
9 -27 2 2.7 NO/ VIS/ NIR/ SWIR
12.7 -25/-30/-50 3/3.5 4.7/4.4/4.3 NO/ VIS/ NIR/ SWIR
25 -50/-75/-100 3.5/4 6.7/5.6/5.5 NO/ VIS/ NIR/ SWIR
25.4 -50/-75/-100/-150 3.5/4 6.9/5.6/5.6/5.05 NO/ VIS/ NIR/ SWIR
25.4 -200/-300/-600/-1000 4.21/4.48/4.74/4.84 5 NO/ VIS/ NIR/ SWIR
50.8 -75/-100/-150 3.5/4 13/10.7/8.3 NO/ VIS/ NIR/ SWIR
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